Thunderstone Search Appliance Manual

These fields will be searched by the user's text query. Fields listed higher
will be weighted higher in search results, according to the Position in
Text search setting.
Additional Fields may be selected, if they are to be searched by
the user's text query. Note that changing Additional Fields'
names, types or order later may affect their presence in Index Fields.

Note that changing these fields will cause indexes to be rebuilt, which
may take several minutes or more for large-data profiles. The old
setting will be used until the index rebuild is complete.